import re
from django.contrib.auth.backends import ModelBackend

from users.models import User

class MyAuthenticateBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            # 判断username是否手机号
            if re.match(r'^1[3-9]\d{9}$', username):
                user = User.objects.get(mobile=username)

            # 如果不是手机号登陆
            else:
                user = User.objects.get(username=username)
        except User.DoesNotExist:
            return None
        if not user.check_password(password):
            return None
        return user
